You work as a database administrator for Certkiller .com. After being hired， you find that there is only one database that is functional and that is being access by the applications. You want to create a replicate of the database， to be used for testing purposes. 
What is the best method to create a replica？（）

单项选择题You work as a database administrator for Certkiller .com. Your database is functional. One of the disks containing a mirrored redo log member has bad sectors in it. You are unable to fix the damaged file.  How does the loss of a redo log member affect the instance of the database that is currently running？（）

A.The instance would normally abort.
B.The instance would not be affected.
C.The instance would be invalid， so would have to be aborted.
D.The instance would remain open， but the LGWR process would fail.
E.The instance would remain open and would automatically create the missing file

单项选择题You work as a database administrator for Certkiller .com. In your organization， you have four databases， Certkiller DB01， Certkiller DB02， Certkiller DB03， and Certkiller DB04， which are located in Berlin， Frankfurt，Rammstein， and Munich respectively， and which were created using Database Configuration Assistant （DBCA）.  You want to perform administrative tasks on these databases that include startup and shutdown， taking regular backups， and so on， fromFrankfurtusing Oracle tools. Which Oracle file would you enable to perform this task？（）

A.Control file
B.Password file
C.Parameter file
D.Online redo log file
E.Listener controller file
F.Server parameter file

多项选择题YouworkasadatabaseadministratorforCertkiller.com.Youwanttocreateyourdatabasewiththeautomaticundomanagementfeatureenable.Whichtwotasksmustyouperformtoachievethis？（）

A.Set the UNDO_RETENTION parameter to AUTO.
B.Create an initial undo segment in undotablespace.
C.Set the UNDO_RETENTION parameter to 900 or more
D.Set the initialization parameter UNDO_MANAGEMENT to AUTO
E.Set the UNDO_MANAGEMENT parameter to the name of an undotablespace

单项选择题You work as a database administrator for Certkiller .com. Because of space constraints， you decided to manually shrink the table. You executed the ALTER TABLE ....SHRINK SPACE statement to shrink the space and you receive an error as follows：  ERROR at Line 1：  ORA-10635： Invalid segment ortablespacetype What could be the reason？（）

A.The table is partitioned
B.The table name is wrong.
C.It is an index-Organized table （IOT）
D.The table is stored in locally managedtablespace.
E.The table is stored in atablespacewhere segment space is managed manually.

单项选择题YouworkasadatabaseadministratorforCertkiller.com.YourdatabaseisinNOARCHIVELOGmodeandyouwanttoperformabackup.Whichtypeofbackupwouldbeappropriateinthiscase？（）

A.Hot backup
B.Online backup
C.consistent backup
D.incremental backup
E.inconsistent backup